Role of Anisotropy in Spin Glass 1/f Noise Measurements

ORAL

Abstract

We have measured the 1/f noise in the resistance of the spin glass state of Cu1-x-yMnxAuy and Ag1-x-yMnxAuy thin films. The magnitude of 1/f noise shows a relatively abrupt increase as the system is cooled below its spin glass transition temperature. Doping of both the Ag and Cu based alloys with Au, allows us to systematically change the strength of the Dzyaloshinskii-Moriya interaction (DMI), a unidirectional anisotropy believed to give metallic spin glasses a more Ising-like characteristic. Witness films fabricated with the noise samples allow us to make a direct comparison of the temperature dependence of our noise measurements and conventional SQUID magnetometry measurements. We also compare our data with previously published results.

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Presenters

  • David Harrison

    University of Minnesota Twin Cities, Physics, University of Minnesota, University of Minnesota - Twin Cities

Authors

  • David Harrison

    University of Minnesota Twin Cities, Physics, University of Minnesota, University of Minnesota - Twin Cities

  • E. Dan Dalhberg

    Physics, University of Minnesota, University of Minnesota - Twin Cities

  • Raymond Orbach

    The University of Texas at Austin, Physics, University of Texas, University of Texas at Austin